/*
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USU
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Description:	Generic scrips and functions
Filename:		usu.jsLib.js
Date:			7 August 2007
Updated:		7 August 2007
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/*	-------------------------------------------------------------
	function tabcontentIDs()
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	Description:	This script is handles the tabbed divs
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	Credits:		Script found on Dynamic Drive DHTML
					http://www.dynamicdrive.com
					Last updated: Nov 8th, 06
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	var enabletabpersistence=1 //enable tab persistence via session only cookies, so selected tab is remembered?
	
	////NO NEED TO EDIT BELOW////////////////////////
	var tabcontentIDs=new Object()
	
	function expandcontent(linkobj){
	var ulid=linkobj.parentNode.parentNode.id //id of UL element
	var ullist=document.getElementById(ulid).getElementsByTagName("li") //get list of LIs corresponding to the tab contents
	for (var i=0; i<ullist.length; i++){
	ullist[i].className=""  //deselect all tabs
	if (typeof tabcontentIDs[ulid][i]!="undefined") //if tab content within this array index exists (exception: More tabs than there are tab contents)
	document.getElementById(tabcontentIDs[ulid][i]).style.display="none" //hide all tab contents
	}
	linkobj.parentNode.className="selected"  //highlight currently clicked on tab
	var divToShow = document.getElementById(linkobj.getAttribute("rel"));
	divToShow.style.display = "block" //expand corresponding tab content
	
///	alert( divToShow.getElementsByTagName( "div" )[0].style.display );//.display="block";
	
	saveselectedtabcontentid(ulid, linkobj.getAttribute("rel"))
	}
	
	function expandtab(tabcontentid, tabnumber){ //interface for selecting a tab (plus expand corresponding content)
	var thetab=document.getElementById(tabcontentid).getElementsByTagName("a")[tabnumber]
	if (thetab.getAttribute("rel"))
	expandcontent(thetab)
	}
	
	function savetabcontentids(ulid, relattribute){// save ids of tab content divs
	if (typeof tabcontentIDs[ulid]=="undefined") //if this array doesn't exist yet
	tabcontentIDs[ulid]=new Array()
	tabcontentIDs[ulid][tabcontentIDs[ulid].length]=relattribute
	}
	
	function saveselectedtabcontentid(ulid, selectedtabid){ //set id of clicked on tab as selected tab id & enter into cookie
	if (enabletabpersistence==1) //if persistence feature turned on
	setCookie(ulid, selectedtabid)
	}
	
	function getullistlinkbyId(ulid, tabcontentid){ //returns a tab link based on the ID of the associated tab content
	var ullist=document.getElementById(ulid).getElementsByTagName("li")
	for (var i=0; i<ullist.length; i++){
	if (ullist[i].getElementsByTagName("a")[0].getAttribute("rel")==tabcontentid){
	return ullist[i].getElementsByTagName("a")[0]
	break
	}
	}
	}
	
	function initializetabcontent(){
	for (var i=0; i<arguments.length; i++){ //loop through passed UL ids
	if (enabletabpersistence==0 && getCookie(arguments[i])!="") //clean up cookie if persist=off
	setCookie(arguments[i], "")
	var clickedontab=getCookie(arguments[i]) //retrieve ID of last clicked on tab from cookie, if any
	var ulobj=document.getElementById(arguments[i])
	var ulist=ulobj.getElementsByTagName("li") //array containing the LI elements within UL
	for (var x=0; x<ulist.length; x++){ //loop through each LI element
	var ulistlink=ulist[x].getElementsByTagName("a")[0]
	if (ulistlink.getAttribute("rel")){
	savetabcontentids(arguments[i], ulistlink.getAttribute("rel")) //save id of each tab content as loop runs
	ulistlink.onclick=function(){
	expandcontent(this)
	return false
	}
	if (ulist[x].className=="selected" && clickedontab=="") //if a tab is set to be selected by default
	expandcontent(ulistlink) //auto load currenly selected tab content
	}
	} //end inner for loop
	if (clickedontab!=""){ //if a tab has been previously clicked on per the cookie value
	var culistlink=getullistlinkbyId(arguments[i], clickedontab)
	if (typeof culistlink!="undefined") //if match found between tabcontent id and rel attribute value
	expandcontent(culistlink) //auto load currenly selected tab content
	else //else if no match found between tabcontent id and rel attribute value (cookie mis-association)
	expandcontent(ulist[0].getElementsByTagName("a")[0]) //just auto load first tab instead
	}
	} //end outer for loop
	}
	
	
	function getCookie(Name){ 
	var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
	if (document.cookie.match(re)) //if cookie found
	return document.cookie.match(re)[0].split("=")[1] //return its value
	return ""
	}
	
	function setCookie(name, value){
	document.cookie = name+"="+value //cookie value is domain wide (path=/)
	}